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Benjamin Newman
New User
Username: cloudscc123

Post Number: 4
Registered: 7-2016
Posted on Thursday, 08 September, 2016 - 05:02 pm:   Edit PostDelete PostView Post/Check IP

Can anyone tell me the thread size and type for Silver Cloud 57 six cylinder exhaust manifold studs? I need to fix a thread and would like to purchase the correct tap.

Also does anyone in Australia sell these studs?
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christopher carnley
Unregistered guest
Posted From: 86.169.76.140
Posted on Friday, 09 September, 2016 - 02:27 am:   Edit PostDelete PostView Post/Check IP

It is 5/16" UNF, the SAE threads. The studs are high grade steel typically EN24 or 1%Cr 1%Ni, and quite difficult to drill out.
Introcar have them.

(Message approved by david_gore)
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David Gore
Moderator
Username: david_gore

Post Number: 2197
Registered: 4-2003
Posted on Friday, 09 September, 2016 - 08:29 am:   Edit PostDelete PostView Post/Check IP

Benjamin,

Do not be tempted to use "high tensile" threaded rod from hardware stores to fabricate the studs as an alternative. These often come from low-cost manufacturers often in Asia and the quality control in their manufacture either leaves a lot to be desired or is non-existent. The OEM studs would be an alloy steel such as En24 [SAE 4340] or similar heat treated to SAE Grade 8 or equivalent specification.

I would recommend purchasing the studs from a recognised R-R/B parts supplier such as Introcar as suggested by Christopher.
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Benjamin Newman
New User
Username: cloudscc123

Post Number: 5
Registered: 7-2016
Posted on Monday, 12 September, 2016 - 08:10 pm:   Edit PostDelete PostView Post/Check IP

Thank you for the advice. For some reason I thought they may have been BSF sizes.

I had one snap inside the block, but have been successful in drilling it out. A 6mm Cobolt did the trick. The remnants I tapped out with a centre punch.. Got a new quality 5/16 UNF tap. All clean now.

I will purchase the real studs. Don't want to cut any corners. Thanks for the Introcar recommendation.
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richard george yeaman
Grand Master
Username: richyrich

Post Number: 613
Registered: 4-2012
Posted on Monday, 12 September, 2016 - 09:55 pm:   Edit PostDelete PostView Post/Check IP

Hi Benjamin there is nothing like a happy ending.

Richard.

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